1 /*

     2  * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.nio.ch;

    27 

    28 import java.nio.channels.*;

    29 import java.nio.channels.spi.AsynchronousChannelProvider;

    30 import java.util.concurrent.ExecutorService;

    31 import java.util.concurrent.ThreadFactory;

    32 import java.net.ProtocolFamily;

    33 import java.io.IOException;

    34 

    35 public class WindowsAsynchronousChannelProvider

    36     extends AsynchronousChannelProvider

    37 {

    38     private static volatile Iocp defaultIocp;

    39 

    40     public WindowsAsynchronousChannelProvider() {

    41         // nothing to do

    42     }

    43 

    44     private Iocp defaultIocp() throws IOException {

    45         if (defaultIocp == null) {

    46             synchronized (WindowsAsynchronousChannelProvider.class) {

    47                 if (defaultIocp == null) {

    48                     // default thread pool may be shared with AsynchronousFileChannels

    49                     defaultIocp = new Iocp(this, ThreadPool.getDefault()).start();

    50                 }

    51             }

    52         }

    53         return defaultIocp;

    54     }

    55 

    56     @Override

    57     public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)

    58         throws IOException

    59     {

    60         return new Iocp(this, ThreadPool.create(nThreads, factory)).start();

    61     }

    62 

    63     @Override

    64     public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)

    65         throws IOException

    66     {

    67         return new Iocp(this, ThreadPool.wrap(executor, initialSize)).start();

    68     }

    69 

    70     private Iocp toIocp(AsynchronousChannelGroup group) throws IOException {

    71         if (group == null) {

    72             return defaultIocp();

    73         } else {

    74             if (!(group instanceof Iocp))

    75                 throw new IllegalChannelGroupException();

    76             return (Iocp)group;

    77         }

    78     }

    79 

    80     @Override

    81     public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)

    82         throws IOException

    83     {

    84         return new WindowsAsynchronousServerSocketChannelImpl(toIocp(group));

    85     }

    86 

    87     @Override

    88     public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)

    89         throws IOException

    90     {

    91         return new WindowsAsynchronousSocketChannelImpl(toIocp(group));

    92     }

    93 

    94     @Override

    95     public AsynchronousDatagramChannel openAsynchronousDatagramChannel(ProtocolFamily family,

    96                                                                        AsynchronousChannelGroup group)

    97         throws IOException

    98     {

    99         return new SimpleAsynchronousDatagramChannelImpl(family, toIocp(group));

   100     }

   101 }